Scaffolding theory is one of the mature teaching methods of constructivism model . The effective interaction between teachers and students is one characteristic of scaffold teaching. This paper aims at combining scaff...Scaffolding theory is one of the mature teaching methods of constructivism model . The effective interaction between teachers and students is one characteristic of scaffold teaching. This paper aims at combining scaffolding theory with classroom interaction in teaching higher vocational students English to help students arouse interest and enhance their comprehensive ability in English learning.展开更多
文摘Scaffolding theory is one of the mature teaching methods of constructivism model . The effective interaction between teachers and students is one characteristic of scaffold teaching. This paper aims at combining scaffolding theory with classroom interaction in teaching higher vocational students English to help students arouse interest and enhance their comprehensive ability in English learning.
文摘通过共沉淀法合成出四氧化三铁磁性纳米粒子,再用二氧化硅对磁性纳米粒子表面进行修饰,最后用分散聚合法合成出磁性聚合物微球.利用红外吸收光谱、热重分析和色谱方法对磁性聚合物微球进行结构表征、热稳定性和萃取性能的考察,并将其应用于尿样中二苯甲酮类物质的分离富集,优化了磁萃取条件,建立了尿样中二苯甲酮类物质的高选择性的分离分析方法.实验结果显示,尿样中的2,4-二羟基二苯甲酮、二苯甲酮、2-羟基-4-甲氧基二苯甲酮在0.05300 ng/m L浓度范围内线性关系良好,检测限(S/N=3)为0.05 ng/m L.